mainline/server kernel NumaChip support enablement...

[Daniel J Blueman]

Hi Leann,

Additional to enabling the config option, if cherrypicking the relevant 
commits is a possibility (since they are upstream and ratified), this 
would make Ubuntu Server 12.04 a compelling option for customers with 
this technology, and help very much.

Attached are the patches which were committed upstream. It would be 
great if you are able to consider adding them to the Ubuntu Server kernel.

Many thanks,
   Daniel

On 09/02/2012 03:39, Leann Ogasawara wrote:
> On Wed, 2012-02-08 at 16:09 +0800, Daniel J Blueman wrote:
>> Dear Ubuntu kernel team,
>
> Hi Daniel,
>
>> Support for Numascale's commodity large-SMP adapters [1] made it into
>> 3.2-rc1. It would be very helpful if you were to enable
>> CONFIG_X86_NUMACHIP on the mainline builds [2], and later for the server
>> kernels. With this enablement, it'll be easy to boot large (>168 cores)
>> systems using newer Ubuntu kernels.
>
> I just want to clarify, when you say "later for the server kernels", do
> you mean "later" as in the Q 12.10 release when we'll have a v3.3 (and
> likely newer) kernel, or are you looking to have this supported in the
> actively developed Precise 12.04 release which means we'd need to
> cherry-pick the following from upstream:
>
> commit 44b111b519160e33fdc41eadb39af86a24707edf
> Author: Steffen Persvold<sp at numascale.com>
> Date:   Tue Dec 6 00:07:26 2011 +0800
>
>      x86: Add NumaChip support
>
> commit 3fe54564a61f72982032423d24041dca30617ca2
> Author: Daniel J Blueman<daniel at numascale-asia.com>
> Date:   Wed Jan 25 14:35:49 2012 +0800
>
>      x86/numachip: Drop unnecessary conflict with EDAC
>
> Thanks,
> Leann
>
>> Since the APIC probe function (to select the NumaChip APIC handler)
>> looks at one string in an ACPI table, the boot-time overhead should be
>> only around a couple of hundred instructions, and there is no run-time
>> overhead.
>>
>> Let me know if you need more information.
>>
>> Many thanks,
>>     Daniel
>>
>> [1] http://numascale.com/numa_N323_adapter.html
>> [2] http://kernel.ubuntu.com/~kernel-ppa/mainline/
-- 
Daniel J Blueman
Principal Software Engineer, Numascale Asia
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